For One Day Free Demo www.tradelinecommodity.com India's No.1mcx Tips Provider Call Whatsapp @:8533828881 /8057046270 https://api.whatsapp.com/send?phone=918057046270 UPDATE 3-Oil rises as supply constraints outweigh China slowdown fears * Oil has surged 30-40 pct this yr amid tightening market * China 2019 GDP to slow towards 30-yr low -Reuters poll * Brent set for third, WTI for sixth weekly gain (Changes dateline to London, updates prices, adds details, comment) By Shadia Nasralla LONDON, April 12 - Oil prices rose on Friday as involuntary supply cuts from Venezuela, Libya and Iran supported perceptions of a tightening market, already underpinned by a production reduction deal from OPEC and its allies.Brent crude oil futures were at $71.39 per barrel at 0832 GMT, up 56 cents from their last close and heading for a weekly gain of 1.5 percent, their third weekly gain in a row.U.S. West Texas Intermediate (WTI) crude futures were at $64.19 per barrel, up 61 cen